Stamp-mill.



N. T. HARRlNGTON STAMP MILL.

APPLICATION FILED OCT. 30; 1909. I 13,144,126. Patented June 22,1915.

3 SHEETS-SHEET 1.

N. T. HARRINGTON.

STAMP MILL.

APPLICATION FILED OCT. 30. 1909.

1, 1 44:, 1 26 Patented June 22, 1915.

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STAMP MILL.

APPLICATION FILED OCT. 30. 1909.

1,144,126. Patented June 22, 1915.

3 SHEETS-SHEET 3.

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WTTED STATES PATENT @FFTfiE.

NORMAN TAYLOR HARRINGTON, OF LANSING, MICHIGAN.

STAMP-MILL.

Application filed October 30, 1909.

To all whom it may concern:

Be it known that I, NORMAN TAYLOR HAR- RINGTON, a citizen of the United States of America, residing at Lansing, in the county of Ingham and State of Michigan, have invented certain new and useful Improvements in Stamp-Mills, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention relates to stamp mills and consists in the novel means employed for actuating the plunger and for governing the force of the blow delivered thereby, as hereinafter set forth.

' In the drawingsFigure l is an elevation of the machine; Fig. 2 is a vertical central section therethrough; Fig. 3 is a diagram illustrating the operation. Fig. 4 is a similar view showing a modified construction; and Fig. 5 is an enlarged section of one of the valves.

A is the bed or base plate upon which is mounted the mortar B.

C is the plunger which is provided with an upwardly-extending actuating rod D slidably engaging the guide bearings E in a frame F. The frame F supports at its upper end a cylinder G within which is arranged a piston H secured to a piston rod I connected by the coupling J to the rod D.

he piston is actuated by the explosion of a gaseous charge in the lower portion of the cylinder which lifts the plunger and permits it upon its return stroke to deliver the blow upon the material in the mortar. The force of this blow is intensified by arranging a resilient cushion above the piston, which stores the energy of the explosion and gives it out upon the return stroke.

The specific construction and organization of the explosion motor may be varied, but I preferably construct it as follows: K is the lower head of the cylinder through which the rod I extends. This head is arranged to clear the lower end of the piston when the latter is at the limit of its downward stroke,

but under ordinary conditions the material in the mortar against which the blow is delivered will prevent a full downward stroke of the piston. There is consequently a chamber L of varying capacity between the head K of the cylinder and the piston and into this chamber the explosive charge is introduced.

M is the inlet valve controlling the admission of the explosive charge and N is the ex- Specification of Letters Patent.

Patented June 22, 1915.

Serial No. 525,559.

haust valve. There is also an exhaust port I in the cylinder arranged to be uncovered when the piston H is at the upper end of its stroke, and Q is an exhaust conduit connecting with both the port P and the exhaust valve N. Any suitable construction of igniter may be provided for exploding the charge.

The explosive charge is preferably introduced into the chamber L under the proper compression desired for explosions. For this purpose, both the air and the gas employed for making the mixture are initially compressed and, as illustrated in Fig. 3, B is a tank containing the compressed air, and S is a gas conduit under substantially the same pressure. The air and gas are mixed as they are introduced in the chamber L and, as shown in Fig. 2, T is a piston valve connected with the valve M and having ports which are registered simultaneously with the gas admission port T and the air admission port T This will permit both gases to enter the hollow or chamber within the valve T in which they are thoroughly commingled before entering the chamber L.

As the explosive charge is preferably under relatively high compression, it would immediately actuate the piston in an upward direction before the explosion of the charge. Such a result is prevented by con necting the air tank R by a conduit R with the chamber in the cylinder above the piston H. Thus the pressure upon opposite sides of the piston is equalized and the latter remains stationary until the charge in the chamber L is exploded. When this occurs, the compressed air in the upper portion of the cylinder is forced backward through the conduit B into the tank R, but is returned again on the downward stroke to increase the force of the blow. The conduit R is connected at a point below the upper end of the cylinder and that part of the cylinder above the conduit connection serves as an air pocket to protect the upper head K of the cylinder from impact of the upwardly moving piston.

The operation of the motor is preferably timed by independently driven mechanism, which controls the operation of the valves M and N. As diagrammatically illustrated in Fig. 3, U is a constantly driven shaft operated by any suitable motor, not shown.

U is a crank upon said shaft for operating the valve M, and U is a second crank,

said cranks operating through the rods V V and levers WV WV for operating the valve N. Thus the timing of the engine is not dependent upon the force of the explosion, or

in any other Way upon the operation of the motor itself.

In the operation of the stamp, the mate rial to be crushed is fed into the mortar N where it forms a cushion for the plunger C.

Thus if the mortar is very full of material,

itwill arrest the downward movement of the plunger at a higher point than where the mortar is comparatively empty. The variation in the stroke of the plunger permits of an automatic governing of the force of the explosion, as it is obvious that where the piston is arrested high in the cylinder G, the chamber L will be of greater capacity, and consequently a larger charge of the explosive mixture is introduced therein, proportionately increasing the force of the explosion. The variation of the force of the explosion will produce a corresponding variation in the length of the upward stroke of the piston before its inertia is overcome by the compressed air thereabove, and this in turn produces a variation in the force of the blow delivered by the plunger upon its return stroke. Thus as the quantity of material in the mortar is increased, the force of the blow delivered by the plunger is increased, While the decrease in the amount of material will correspondingly decrease the impact of the plunger.

lVith a construction as illustrated in Fig. 4, the upper portion of the cylinder forms a closed pocket. When the piston is doWn, this pocket contains air at atmospheric pressure, but during the upward stroke, the air is compressed and forms the resilient cushion for actuating the piston on its return stroke. The explosive charge is admitted below the piston, and, to prevent movement of the piston before the explosion, a quick said plunger by the quantity of material in 5 7 said material holding member,an explosion motor for actuating said'plunger, and means for governing said explosion motor by the variable stroke of said plunger to vary the power developed.

2. The combination with a material holding member, of a plunger, an explosion'motor for actuating said plunger, means for varying the quantity of material in said member, and automatic means depending upon the varying quantity of material for V varying the power developed by said explosion member.

3. The combination with a material holding member, of a plunger, a motor for actuating saidplunger, means for varying the quantity of the material in said materialholding member, and automaticmeans controlling said motor for'varying the impact of said plunger according to the variations of quantity of material in the material holding member.

In testimony whereof I afiix my signature in presence of two Witnesses.

l V NORMAN TAYLOR HARRINGTON- Witnesses:

JAMES P. BARRY, HARRY W. GRAHAM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

. Washington, D. G. r 

